How to Write an Invoice for Services Rendered in Nigeria (With Template)

Whether you are a freelancer, sole trader, or registered business, knowing how to write a correct invoice for services rendered in Nigeria is a fundamental business skill. A proper invoice protects you legally, keeps your FIRS records clean, and - most importantly - gets you paid.

This guide walks you through every element of a Nigerian services invoice, step by step.

What Is an Invoice for Services Rendered?

An invoice for services rendered is a formal payment request issued after you have completed work for a client. Unlike a proforma invoice (which is sent before work begins) or a quotation (which is a price offer), a services invoice confirms that the work has been done and payment is now due.

Step-by-Step: How to Write a Services Invoice in Nigeria

Step 1: Add Your Business Information

At the top of the invoice, include:

• Full name or registered business name
• Business address (physical address, not just a P.O. Box)
• Phone number and email address
• Tax Identification Number (TIN) - mandatory if you are VAT-registered; recommended even if not
• CAC Registration Number - if your business is registered with the Corporate Affairs Commission

Step 2: Add the Client's Information

• Client's full name or company name
• Client's physical address
• Client's email and phone number
• Client's TIN - required for B2B invoices where the client will deduct WHT or claim input VAT

Step 3: Assign an Invoice Number and Date

• Invoice number - unique and sequential (e.g., INV-2026-022). Never reuse numbers.
• Invoice date - the date you issue the invoice
• Due date - the specific calendar date payment is expected (e.g., "Due: 25 March 2026")

Avoid vague terms like "Due on receipt" or "Net 30" without a specific date - these create ambiguity and delay payment.

Step 4: Describe the Services Rendered

This is the most important section. Be specific and itemised. Vague descriptions like "Services rendered - ₦200,000" invite disputes.

Good example:

Bad example:

Professional services - March 2026: ₦300,000

Step 5: Calculate and Show VAT

If you are VAT-registered with FIRS:

• Calculate VAT at 7.5% on the subtotal (before VAT)
• Show VAT as a separate line item - do not roll it into the total
• Your VAT registration number must appear on the invoice

If you are not VAT-registered, do not include a VAT line. Charging VAT without FIRS registration is a compliance violation.

Step 6: Add Payment Details

• Bank name
• Account number
• Account name (must match your registered business or personal name exactly)
• Or a Paystack payment link for instant card or bank transfer payment

Step 7: Add Payment Terms

State your terms clearly:

"Payment is due by 25 March 2026. Overdue balances attract interest at 3% per month. Please reference invoice number INV-2026-022 with your payment."

Step 8: Add Your Signature (Optional but Recommended)

For formal B2B invoices, a signature or stamp adds credibility. For digital invoices, your name and title is sufficient.

Free Services Invoice Template - Nigeria

INVOICE

[Your Business Name] [Address] | [Phone] | [Email] TIN: [Your TIN] | CAC No: [Your RC Number]

Invoice No: INV-2026-XXX Invoice Date: [Date] Due Date: [Due Date]

Bill To: [Client Name / Company] [Client Address] [Client TIN]

Payment Details: Bank: [Bank Name] Account Number: [Account Number] Account Name: [Account Name]

Payment Terms: Payment due by [specific date]. Overdue balances attract 3% monthly interest.

Thank you for your business.

Common Mistakes on Nigerian Services Invoices

1. No due date - "Payment due on receipt" is not enforceable. Use a specific date.
2. Lump-sum description - always itemise; do not bundle services into one line
3. Wrong VAT calculation - VAT is 7.5% of the subtotal, not of the total
4. No invoice number - required by FIRS for VAT invoices; essential for record-keeping
5. Missing TIN - if VAT-registered, your TIN must appear on every invoice
6. No payment reference instruction - tell clients what reference to use so you can match incoming payments

Send Your Invoice via WhatsApp

Most Nigerian clients respond faster on WhatsApp than email. Save your invoice as a PDF and send it on WhatsApp - then follow up on email for formal documentation.

InvoiceGenerator.ng lets you create a professional services invoice in under 2 minutes, with automatic VAT calculation, Paystack payment links, and direct WhatsApp sharing.

For the full guide to Nigerian invoicing compliance, payment terms, and FIRS requirements, see our Nigerian Invoicing Guide.